Anyone use or have used any good ergonomic mice? I currently have the 3M joystick shaped one but it's not really working out for me and neither do the ones with the huge trackball. I've been looking at the Switch Mouse and it looks alright despite it not having the nice scrolling features. If anyone knows of any ergo mice that work great with OS X or work fine with Steermouse it would mean alot to me. Price isn't an issue so please recommend me anything. Thanks!